Fiancée speaks out after ex-boyfriend shot and killed her husband-to-be in 2018

A young Florida couple was planning for their wedding, but when the future groom went to the front door expecting the delivery of a custom-made engagement ring, he was met instead by an assassin. The investigation took a surprising turn when a tip led a detective to a meticulous murder plan found in a trash can. "48 Hours" correspondent Peter Van Sant joins CBSN to discuss.